/**
 * 扩展jQuery
 */
jQuery.extend(
{
    /**
     * @see   将json字符串转换为对象
     * @param   json字符串
     * @return 返回object,array,string等对象
     */
    evalJSON : function (strJson) {
        return eval( "(" + strJson + ")");
    }
});
jQuery.extend(
{
    /**
     * @see   将javascript数据类型转换为json字符串
     * @param 待转换对象,支持object,array,string,function,number,boolean,regexp
     * @return 返回json字符串
     */
    toJSON : function (object) {
        var type = typeof object;
        if ('object' == type) {
            if (Array == object.constructor)
                type = 'array';
            else if (RegExp == object.constructor)
                type = 'regexp';
            else
                type = 'object';
        }
        switch(type) {
            case 'undefined':
            case 'unknown':
                return;
                break;
            case 'function':
            case 'boolean':
            case 'regexp':
                return object.toString();
                break;
            case 'number':
                return isFinite(object) ? object.toString() : 'null';
                break;
            case 'string':
                return '"' + object.replace(/(\\|\")/g,"\\$1").replace(/\n|\r|\t/g, function() {
                    var a = arguments[0];
                    return (a == '\n') ? '\\n':
                    (a == '\r') ? '\\r':
                    (a == '\t') ? '\\t': ""
                }) + '"';
                break;
            case 'object':
                if (object === null)
                    return 'null';
                var results = [];
                for (var property in object) {
                    var value = jQuery.toJSON(object[property]);
                    if (value !== undefined)
                        results.push(jQuery.toJSON(property) + ':' + value);
                }
                return '{' + results.join(',') + '}';
                break;
            case 'array':
                var results = [];
                for(var i = 0; i < object.length; i++) {
                    var value = jQuery.toJSON(object[i]);
                    if (value !== undefined)
                        results.push(value);
                }
                return '[' + results.join(',') + ']';
                break;
        }
    }
});
    function undulpicate(array){  
        for(var i=0;i<array.length;i++) {  
            for(var j=i+1;j<array.length;j++) {  
                //注意 ===  
                if(array[i]===array[j]) {  
                    array.splice(j,1);  
                    j--;  
                }  
            }  
        }  
        return array;  
    }